Battery cell capable of reducing thermal runaway risk

Abstract

The utility model relates to a battery cell capable of reducing the risk of thermal runaway. Relates to the technical field of new energy batteries. The device specifically comprises a positive pole, a negative pole, a first resistance wire and a second resistance wire, the positive pole and the negative pole are arranged at an interval, one end of the first resistance wire is connected with the positive pole, one end of the second resistance wire is connected with the negative pole, and the other end of the first resistance wire is wound with the other end of the second resistance wire. A hot melt adhesive film is coated on the outer side of one end, which is wound with each other, of the first resistance wire and the second resistance wire and is used for insulation, and the hot melt adhesive film is melted at a high temperature and is used for conducting the first resistance wire and the second resistance wire. When the battery cell generates thermal runaway, the hot melt adhesive film is melted, the first resistance wire and the second resistance wire are in a conducting state, and electric energy of the battery cell is converted into heat energy to be released through the first resistance wire and the second resistance wire, so that the energy reserve of the battery cell for thermal runaway is reduced, and the risk of thermal runaway of the battery cell is further reduced; the battery is safe, reliable and low in cost, and the safety performance of the battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially relates to a kind of electric cores for reducing the risk of thermal runaway

[0002] Electric core. BACKGROUND

[0003] In the rapid development of new energy vehicles, portable electronic devices and other industries today, battery technology has become one of the core powers to promote this trend. Among them, lithium-ion batteries have become the mainstream choice in the market due to their high energy density, long cycle life and lightweight characteristics. However, behind this, a problem that cannot be ignored is emerging quietly - electric core thermal runaway. Electric core thermal runaway refers to the phenomenon that under certain conditions, a violent chemical reaction occurs inside the battery, generating a large amount of heat, causing the temperature to rise rapidly, and triggering a chain reaction. This phenomenon not only leads to a sharp decline in battery performance, but more seriously, it may cause a fire or even an explosion, posing a great threat to personnel and property safety.

[0004] Currently, the safety of electric core thermal runaway is mainly improved through the following three points: 1. Optimizing battery materials, developing more stable electrolyte, negative electrode and separator materials, and improving overall heat resistance and safety; 2. Fault early warning mechanism, using big data analysis and machine learning algorithms to predict potential abnormal conditions in advance and achieve early intervention; 3. Emergency cutoff device, which automatically cuts off power supply when detecting abnormal heating signals to reduce the likelihood of danger. However, improving safety by optimizing battery materials is costly and requires a lot of experimental accumulation, while big data analysis and heating signal recognition have errors and delays. Therefore, how to reduce the risk of electric core thermal runaway, and be safe, reliable and low cost, is a problem that needs to be solved. UTILITY MODEL CONTENTS

[0005] The utility model aims at the deficiencies of the prior art, and provides an electric core for reducing the risk of thermal runaway, which can reduce the risk of electric core thermal runaway, and is safe, reliable and low cost, thereby improving the safety performance of the battery.

[0006] The utility model provides an electric core for reducing the risk of thermal runaway, which comprises positive and negative poles arranged at intervals, a first resistance wire connected to one end of the positive pole, and a second resistance wire connected to one end of the negative pole. The other end of the first resistance wire is wound around the other end of the second resistance wire. The outer side of the wound end of the first and second resistance wires is coated with a hot melt adhesive film for insulation. The hot melt adhesive film melts at high temperature to make the first and second resistance wires conductive.

[0007] Further, the battery cell further comprises a packaging sleeve, the packaging sleeve is arranged outside the mutual winding end of the first resistance wire and the second resistance wire, and the hot melt adhesive film is located between the packaging sleeve and the first resistance wire and the second resistance wire.

[0008] Further, the packaging sleeve is made of PET material, and the thickness of the packaging sleeve is between 0.5 and 1 mm.

[0009] Further, the battery cell further comprises a temperature sensor, the temperature sensor is arranged on the positive pole and / or the negative pole.

[0010] Further, the battery cell further comprises a fuse, the fuse is used to cut off the internal circuit of the battery cell when the fuse is fused.

[0011] Further, the fuse is arranged on the positive pole, and one end of the first resistance wire is connected with the fuse.

[0012] Further, the battery cell further comprises a top cover plate, the positive pole and the negative pole are arranged at intervals on the top cover plate, and the first resistance wire and the second resistance wire are located between the positive pole and the negative pole.

[0013] Further, after the positive pole and the negative pole penetrate through the top cover plate, one end of the positive pole and the negative pole extends to the inside of the top cover plate, and the other end of the positive pole and the negative pole extends to the outside of the top cover plate, the first resistance wire and the second resistance wire are located on the inside of the top cover plate, and the temperature sensor is located on the outside of the top cover plate.

[0014] Further, the battery cell further comprises a shell, the shell is internally provided with a cavity with a top opening, and the top cover plate is fixedly connected with the shell and used to close the top opening of the cavity.

[0015] Further, the battery cell further comprises two cell packs arranged side by side in the cavity, the positive pole tabs of the two cell packs are electrically connected with the positive pole on the inside of the top cover plate, and the negative pole tabs of the two cell packs are electrically connected with the negative pole on the inside of the top cover plate.

[0016] The battery cell for reducing the risk of thermal runaway has the following beneficial effects:

[0017] (1) When the battery cell generates thermal runaway, the hot melt adhesive film melts, so that the first resistance wire and the second resistance wire are in a conductive state, the electric energy of the battery cell is converted into heat energy through the first resistance wire and the second resistance wire, thereby reducing the energy reserve of the battery cell for thermal runaway, slowing down the rapid and high-energy chain redox reaction in the thermal runaway state of the battery cell, and further reducing the risk of thermal runaway of the battery cell, and the battery cell is safe and reliable, low in cost, and high in safety performance.

[0018] (2) The first resistance wire and the second resistance wire are fixed by the packaging sleeve, so that the first resistance wire and the second resistance wire remain in a conductive state after the hot melt adhesive film melts, and then the electric energy of the battery cell is converted into heat energy by the first resistance wire and the second resistance wire, thereby reducing the risk of thermal runaway of the battery cell, and the safety is reliable and the cost is low;

[0019] (3) The packaging sleeve of the battery cell is made of PET material, and the thickness of the packaging sleeve is between 0.5-1mm, so that the one end of the first resistance wire and the second resistance wire is fixed by the packaging sleeve, which not only enhances the connection strength of the first resistance wire and the second resistance wire, but also insulates the one end of the first resistance wire and the second resistance wire, so that the practicality of the battery cell is stronger;

[0020] (4) The battery cell further comprises a temperature sensor, when the battery cell generates thermal runaway, the first resistance wire and the second resistance wire transmit the temperature to the temperature sensor through the positive pole and the negative pole, and the temperature sensor converts the temperature into an electric signal and transmits it to the battery management system outside the battery cell, so that the battery management system can quickly and timely make power-off protection and warning, thereby further reducing the risk of thermal runaway of the battery cell and improving the safety performance of the battery;

[0021] (5) The fuse of the battery cell is arranged on the positive pole, and when the one end of the first resistance wire is connected with the positive pole, the fuse is connected, when the battery cell generates severe thermal runaway, the temperature of the first resistance wire rises sharply, and the fuse on the positive pole is fused, so that the internal circuit of the battery cell is cut off through the fuse, and the rapid and high-energy chain redox reaction in the thermal runaway state of the battery cell is completely prevented, thereby further reducing the risk of thermal runaway of the battery cell and improving the safety performance of the battery;

[0022] (6) The battery cell further comprises two core packs, and the two core packs are arranged side by side in the cavity of the shell, when the top cover plate is fixedly connected with the shell and the top opening of the cavity is closed, the positive pole of the two core packs is led out through the positive pole lug of the two core packs and the positive pole of the top cover plate, and the negative pole of the two core packs is led out through the negative pole lug of the two core packs and the negative pole of the top cover plate, thereby realizing the charging and discharging function of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In these drawings, like reference numerals are used to represent similar elements.

[0024] Fig. 1The thermal melt adhesive film and the packaging sleeve of the battery cell for reducing the risk of thermal runaway of the embodiment of the utility model are arranged outside the first resistance wire and the second resistance wire.

[0025] Fig. 2 The structure diagram of the first resistance wire and the second resistance wire of the battery cell for reducing the risk of thermal runaway of the embodiment of the utility model is connected with the positive pole and the negative pole on the top cover plate.

[0026] Fig. 3 The installation diagram of the core package of the battery cell for reducing the risk of thermal runaway of the embodiment of the utility model is inside the top cover plate.

[0027] Fig. 4 The assembly explosion diagram of the battery cell for reducing the risk of thermal runaway of the embodiment of the utility model.

[0028] In the drawing: 1, first resistance wire; 2, second resistance wire; 3, thermal melt adhesive film; 4, packaging sleeve; 5, positive pole; 6, negative pole; 7, fuse; 8, top cover plate; 9, shell; 91, cavity; 10, core package; 101, positive pole lug; 102, negative pole lug. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model more clear, the technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model, and all other embodiments obtained by the person skilled in the art without creative labor based on the embodiment in the utility model belong to the protection scope of the utility model.

[0030] Please refer to Figs. 1-4 The battery cell for reducing the risk of thermal runaway of the embodiment of the utility model comprises positive pole 5 and negative pole 6 arranged at intervals, first resistance wire 1 connected with positive pole 5 at one end, and second resistance wire 2 connected with negative pole 6 at one end, the other end of first resistance wire 1 and the other end of second resistance wire 2 are wound with each other, the one end outside of first resistance wire 1 and second resistance wire 2 wound with each other is covered with thermal melt adhesive film 3 for insulation, thermal melt adhesive film 3 melts under high temperature for making first resistance wire 1 and second resistance wire 2 conductive.

[0031] In the present application, the battery cell package 10 includes a positive pole 5, a negative pole 6, a first resistance wire 1 and a second resistance wire 2. The positive pole 5 leads out the positive pole of the battery cell, and the negative pole 6 leads out the negative pole of the battery cell, thereby realizing the charging and discharging function of the battery cell. One end of the first resistance wire 1 is connected to the positive pole 5, one end of the second resistance wire 2 is connected to the negative pole 6, and the end of the first resistance wire 1 away from the positive pole 5 is wound with the end of the second resistance wire 2 away from the negative pole 6, so that the first resistance wire 1 and the second resistance wire 2 are conductive.

[0032] A hot melt adhesive film 3 is arranged on the outer side of the first resistance wire 1 and the second resistance wire 2, and the hot melt adhesive film 3 covers the end of the first resistance wire 1 and the second resistance wire 2 wound with each other, thereby insulating the first resistance wire 1 and the second resistance wire 2 by the hot melt adhesive film 3.

[0033] Since the melting temperature range of the hot melt adhesive film 3 is usually between 120°C and 160°C, and the normal working temperature of the battery cell is about 70°C~100°C, when the battery cell is normally working, the hot melt adhesive film 3 insulates the first resistance wire 1 and the second resistance wire 2, and the first resistance wire 1 and the second resistance wire 2 are in a non-conductive state, that is, the positive pole 5 and the negative pole 6 of the battery cell are not conductive, so that the positive pole 5 and the negative pole 6 normally charge and discharge.

[0034] When the battery cell produces thermal runaway and the temperature of the battery cell reaches 120°C or above, under the action of high temperature, the hot melt adhesive film 3 melts, so that the first resistance wire 1 and the second resistance wire 2 are in a conductive state, that is, the positive pole 5 and the negative pole 6 of the battery cell are conductive through the first resistance wire 1 and the second resistance wire 2, so that the electrical energy generated by the battery cell is converted into heat energy through the first resistance wire 1 and the second resistance wire 2, reducing the energy reserve available for thermal runaway of the battery cell, slowing down the rapid and high-energy chain redox reaction in the thermal runaway state of the battery cell, thereby reducing the risk of thermal runaway of the battery cell, and being safe and reliable, low in cost, and improving the safety performance of the battery.

[0035] In the present embodiment, the battery cell further includes a packaging sleeve 4, which is arranged on the outer side of the end of the first resistance wire 1 and the second resistance wire 2 wound with each other, and the hot melt adhesive film 3 is located between the packaging sleeve 4 and the first resistance wire 1 and the second resistance wire 2. In order to prevent the end of the first resistance wire 1 and the second resistance wire 2 wound with each other from being disconnected after the hot melt adhesive film 3 melts, causing the first resistance wire 1 and the second resistance wire 2 to be unable to conduct, therefore, in the present application, the end of the first resistance wire 1 and the second resistance wire 2 wound with each other is sleeved with the packaging sleeve 4 on the outer side, and the hot melt adhesive film 3 is located between the packaging sleeve 4 and the first resistance wire 1 and the second resistance wire 2.

[0036] The one end of the first resistance wire 1 and the second resistance wire 2 which are wound with each other is fixed by the packaging sleeve 4, so that the first resistance wire 1 and the second resistance wire 2 remain in a conduction state after the hot melt adhesive film 3 is melted, and then the electric energy of the battery cell is converted into heat energy by the first resistance wire 1 and the second resistance wire 2, thereby reducing the risk of thermal runaway of the battery cell.

[0037] Specifically, in the embodiment, the packaging sleeve 4 is made of PET material, and the thickness of the packaging sleeve 4 is between 0.5-1mm. Since the PET material has high heat resistance, high strength and good mechanical properties, etc., when the battery cell produces thermal runaway, the packaging sleeve 4 made of PET material and having a thickness of 0.5-1mm is not easy to deform, thereby ensuring the connection strength of the first resistance wire 1 and the second resistance wire 2.

[0038] In addition, since the PET material has good electrical insulation performance, the packaging sleeve 4 made of PET material is sleeved outside the one end of the first resistance wire 1 and the second resistance wire 2 which are wound with each other, which can insulate the one end of the first resistance wire 1 and the second resistance wire 2 which are wound with each other from the outside, thereby making the utility of the battery cell stronger.

[0039] In the embodiment, the battery cell further includes a temperature sensor, which can be two respectively arranged on the positive pole 5 and the negative pole 6, or one arranged only on the positive pole 5, or one arranged only on the negative pole 6.

[0040] When the battery cell produces thermal runaway and the high temperature produced melts the hot melt adhesive film 3, the first resistance wire 1 and the second resistance wire 2 are in a conduction state, so that the electric energy generated by the battery cell is converted into heat energy when flowing through the first resistance wire 1 and the second resistance wire 2, and at the same time, the first resistance wire 1 and the second resistance wire 2 transfer heat through the positive pole 5 and the negative pole 6 to the temperature sensor, the temperature sensor converts the temperature into an electrical signal and transmits it to the battery management system outside the battery cell, so that the battery management system can quickly and timely make power-off protection and warning, thereby further reducing the risk of thermal runaway of the battery cell, and the cost is low, safe and reliable, thereby improving the safety performance of the battery.

[0041] In the foregoing embodiment, it is mentioned that when the battery cell produces thermal runaway and the high temperature produced melts the hot melt adhesive film 3, the first resistance wire 1 and the second resistance wire 2 are in a conduction state, so that the electric energy generated by the battery cell is converted into heat energy, which can only slow down the rapid and high-energy chain redox reaction in the state of thermal runaway of the battery cell, but cannot completely prevent it.

[0042] Therefore, in the embodiment, the battery cell further comprises a fuse 7, when the battery cell generates more severe thermal runaway, the high temperature generated will melt the fuse 7, thereby cutting off the circuit inside the battery cell through the fuse 7, completely preventing the rapid and high-energy chain redox reaction in the thermal runaway state of the battery cell, further reducing the risk of thermal runaway of the battery cell, and improving the safety performance of the battery.

[0043] Specifically, in the embodiment, the fuse 7 is arranged on the positive pole 5, and one end of the first resistance wire 1 is connected with the positive pole 5 and connected with the fuse 7. When the battery cell generates severe thermal runaway, the temperature of the first resistance wire 1 rises sharply, and the fuse 7 on the positive pole 5 is melted, thereby cutting off the circuit inside the battery cell through the fuse 7, completely preventing the rapid and high-energy chain redox reaction in the thermal runaway state of the battery cell, further reducing the risk of thermal runaway of the battery cell, and improving the safety performance of the battery.

[0044] In the embodiment, the battery cell further comprises a top cover plate 8, and the positive pole 5 and the negative pole 6 are arranged on the top cover plate 8 in a spaced manner, so that the positive pole of the battery cell is led out through the positive pole 5 on the top cover plate 8, and the negative pole of the battery cell is led out through the negative pole 6, thereby realizing the charging and discharging function of the battery cell.

[0045] The first resistance wire 1 and the second resistance wire 2 are arranged between the positive pole 5 and the negative pole 6, and one end of the first resistance wire 1 is connected with the positive pole 5, one end of the second resistance wire 2 is connected with the negative pole 6, and the other end of the first resistance wire 1 and the other end of the second resistance wire 2 are wound with each other, so that when the battery cell generates thermal runaway, the first resistance wire 1 and the second resistance wire 2 are in a conducting state through the melting of the heat-sealing adhesive film 3, and then the heat energy generated by the battery cell is released through the first resistance wire 1 and the second resistance wire 2, thereby reducing the risk of thermal runaway of the battery cell, and being safe, reliable and low in cost.

[0046] Further, in the embodiment, after the positive pole 5 and the negative pole 6 penetrate the top cover plate 8, one end extends on the inner side of the top cover plate 8 and the other end extends on the outer side of the top cover plate 8, the first resistance wire 1 and the second resistance wire 2 are located on the inner side of the top cover plate 8, and the temperature sensor is located on the outer side of the top cover plate 8.

[0047] In the present application, when the positive pole 5 and the negative pole 6 are arranged on the top cover plate 8 in a spaced manner, they penetrate the top cover plate 8, so that one end of the positive pole 5 and the negative pole 6 extends on the inner side of the top cover plate 8 and the other end extends on the outer side of the top cover plate 8. The first resistance wire 1 and the second resistance wire 2 are located on the inner side of the top cover plate 8, so that one end of the first resistance wire 1 is connected with the end of the positive pole 5 extending on the inner side of the top cover plate 8, and one end of the second resistance wire 2 is connected with the end of the negative pole 6 extending on the inner side of the top cover plate 8.

[0048] The temperature sensor is located outside the top cover plate 8, that is, the temperature sensor is provided on two ends of the positive pole 5 and the negative pole 6 extending outside the top cover plate 8, or provided on one end of the positive pole 5 extending outside the top cover plate 8, or provided on one end of the negative pole 6 extending outside the top cover plate 8.

[0049] When the battery cell generates thermal runaway, the first resistance wire 1 and the second resistance wire 2 conduct heat through the positive pole 5 and the negative pole 6 to transfer the temperature to the temperature sensor, and the temperature sensor converts the temperature into an electrical signal and transmits the electrical signal to the battery management system outside the battery cell, so that the battery management system can quickly and timely make power-off protection and warning, thereby further reducing the risk of thermal runaway of the battery cell and improving the safety performance of the battery.

[0050] In the embodiment, the battery cell further comprises a shell 9, the shell 9 is provided with a cavity 91 with a top opening, and the top cover plate 8 is fixedly connected with the shell 9 to close the top opening of the cavity 91. In the present application, the battery cell further comprises a shell 9, the shell 9 is provided with a cavity 91 with a top opening, and the top cover plate 8 is fixedly connected with the shell 9 to close the top opening of the cavity 91, thereby sealing the shell 9, and then leading out the positive pole of the battery cell through the positive pole 5 on the top cover plate 8 and leading out the negative pole of the battery cell through the negative pole 6, to realize the charging and discharging function of the battery cell.

[0051] In the embodiment, the battery cell further comprises two cell packs 10 arranged side by side in the cavity 91, and the positive pole tabs 101 of the two cell packs 10 are electrically connected with the positive pole 5 on the inner side of the top cover plate 8, and the negative pole tabs 102 of the two cell packs 10 are electrically connected with the negative pole 6 on the inner side of the top cover plate 8. In the present application, the battery cell further comprises two cell packs 10 arranged side by side in the cavity 91 of the shell 9.

[0052] When the top cover plate 8 is fixedly connected with the shell 9 to close the top opening of the cavity 91, the positive pole tabs 101 of the two cell packs 10 are electrically connected with the positive pole 5 on the inner side of the top cover plate 8, so that the positive pole 5 leads out the positive poles of the two cell packs 10, and the negative pole tabs 102 of the two cell packs 10 are electrically connected with the negative pole 6 on the inner side of the top cover plate 8, so that the negative pole 6 leads out the negative poles of the two cell packs 10, thereby realizing the charging and discharging function of the battery cell.

[0053] Specifically, in actual implementation, the two cell packs 10 can be first placed horizontally on both sides of the top cover plate 8, the positive pole tabs 101 of the two cell packs 10 are fixedly connected with one end of the positive pole 5 extending inside the top cover plate 8 by laser welding, and the negative pole tabs 102 of the two cell packs 10 are fixedly connected with one end of the negative pole 6 extending inside the top cover plate 8, and then the two cell packs 10 are turned to a vertical state, so that the two cell packs 10 are arranged side by side on the inner side of the top cover plate 8.

[0054] Then the two core packs 10 are loaded in the cavity 91 of the shell 9 through the top opening of the cavity 91, the two core packs 10 are arranged side by side in the cavity 91, and finally the top cover plate 8 is welded with the shell 9, so that the top cover plate 8 closes the top opening of the cavity 91, thereby leading out the positive and negative poles of the battery through one end of the positive pole 5 and the negative pole 6 extending outside the top cover plate 8, and realizing the charging and discharging function of the battery.

[0055] The above description can be implemented alone or in various combinations, and these modifications are within the protection scope of the utility model.

[0056] It should be noted that in this paper, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment containing a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including one" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0057] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A battery cell with reduced risk of thermal runaway, characterized in that: It includes a positive electrode post (5) and a negative electrode post (6) spaced apart, a first resistance wire (1) connected to the positive electrode post (5) at one end, and a second resistance wire (2) connected to the negative electrode post (6) at one end. The other end of the first resistance wire (1) and the other end of the second resistance wire (2) are intertwined. The outer side of the intertwined end of the first resistance wire (1) and the second resistance wire (2) is covered with a hot melt adhesive film (3) for insulation. The hot melt adhesive film (3) melts at high temperature to make the first resistance wire (1) and the second resistance wire (2) conduct.

2. A battery cell for reducing the risk of thermal runaway as described in claim 1, characterized in that: The battery cell also includes a packaging sleeve (4), which is located on the outside of the end where the first resistance wire (1) and the second resistance wire (2) are intertwined, and the hot melt adhesive film (3) is located between the packaging sleeve (4) and the first resistance wire (1) and the second resistance wire (2).

3. A battery cell for reducing the risk of thermal runaway as described in claim 2, characterized in that: The encapsulation sleeve (4) is made of PET material, and the thickness of the encapsulation sleeve (4) is between 0.5 and 1 mm.

4. A battery cell for reducing the risk of thermal runaway as described in claim 1, characterized in that: The battery cell also includes a temperature sensor, which is located on the positive terminal (5) and / or the negative terminal (6).

5. A battery cell for reducing the risk of thermal runaway as described in claim 1, characterized in that: The battery cell also includes a fuse (7), which is used to cut off the circuit inside the battery cell when it melts.

6. A battery cell for reducing the risk of thermal runaway as described in claim 5, characterized in that: The fuse (7) is located on the positive terminal post (5), and one end of the first resistance line (1) is connected to the fuse (7).

7. A battery cell with reduced thermal runaway risk as described in claim 4, characterized in that: The battery cell also includes a top cover plate (8), the positive electrode post (5) and the negative electrode post (6) are spaced apart on the top cover plate (8), and the first resistance line (1) and the second resistance line (2) are located between the positive electrode post (5) and the negative electrode post (6).

8. A battery cell with reduced thermal runaway risk as described in claim 7, characterized in that: After the positive electrode post (5) and the negative electrode post (6) pass through the top cover plate (8), one end extends inside the top cover plate (8) and the other end extends outside the top cover plate (8). The first resistance line (1) and the second resistance line (2) are located inside the top cover plate (8), and the temperature sensor is located outside the top cover plate (8).

9. A battery cell with reduced thermal runaway risk as described in claim 8, characterized in that: The battery cell also includes a housing (9), which has a cavity (91) with a top opening inside. The top cover plate (8) is fixedly connected to the housing (9) to close the top opening of the cavity (91).

10. A battery cell with reduced thermal runaway risk as described in claim 9, characterized in that: The battery cell also includes two core packages (10) arranged side by side in the cavity (91). The positive electrode tabs (101) of the two core packages (10) are electrically connected to the positive electrode post (5) on the inner side of the top cover plate (8), and the negative electrode tabs (102) of the two core packages (10) are electrically connected to the negative electrode post (6) on the inner side of the top cover plate (8).

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